rockchip: rk3288: enable TPL for tinker-board

All the config for TPL has been update, we can enable the TPL.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3288/Kconfig b/arch/arm/mach-rockchip/rk3288/Kconfig
index 541301d..c5dcd06 100644
--- a/arch/arm/mach-rockchip/rk3288/Kconfig
+++ b/arch/arm/mach-rockchip/rk3288/Kconfig
@@ -118,6 +118,7 @@
 config TARGET_TINKER_RK3288
 	bool "Tinker-RK3288"
         select BOARD_LATE_INIT
+	select TPL
 	help
 	  Tinker is a RK3288-based development board with 2 USB ports, HDMI,
 	  micro-SD card, audio, Gigabit Ethernet. It also includes on-board